For the investigation of the quantitative regularity of long-term strength reduction process during the operation the service life reduction factor is often applied This factor is also assumed as proportional to equivalent working time of an element or number of flight cycles n :

Neumann's variable pitch compressor stator changes compressor stator or vane pitch angles by ten to thirty degrees during a flight cycle, so that both engine performance and fuel consumption are improved.

Operators will be required within 500 flight cycles to determine if defective parts are installed, and if so, change out the HSTA within a certain number of flight cycles, depending on the in-service time of the unit.

This configuration was introduced in September 2007 and, to date, the fleet of over 800 engines in service worldwide has logged nearly 2 million flight hours and more than 1 million flight cycles without a single engine-related event.

As these assets age and as new aircraft are incorporated into flight cycles, inspection and maintenance/repair/overhaul (MRO) are increasingly top priorities for manufacturers and carrier-operators alike.

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